Simultaneous Determination of Dopamine in Presence of Serotonin at a Graphite Pencil Electrode: a Voltammetric Study

A graphite pencil electrode was used as a working electrode in the analysis of dopamine and serotonin by voltammetric techniques. The electrochemical investigations were carried out at a graphite pencil electrode at a scan rate of 0.05 Vs-1 in a 0.2 M phosphate buffer solution. The electrochemical behavior of dopamine shows two redox pairs while the electrooxidation of serotonin shows irreversible behavior at a graphite pencil electrode at a scan rate of 0.05 Vs-1. A graphite pencil electrode shows excellent results for dopamine and serotonin when combined and acts as very good sensor for dopamine in the presence of serotonin.